VAR_S2R_MDAR      196 libavfilter/vf_scale.c          vars_w[VAR_S2R_MDAR]      || vars_h[VAR_S2R_MDAR]      ||
VAR_S2R_MDAR      445 libavfilter/vf_scale.c         scale->var_values[VAR_S2R_MAIN_DAR] = scale->var_values[VAR_S2R_MDAR] =